Gree GWH12UB-K3DNA4F Service Manual page 75

4. Diagnosis for anti-high temperature, overload protection (AP1 below is control board of outdoor unit)
Main detection point:
● If the outdoor ambient temperature is in normal range;
● If the indoor and outdoor fan is running normal;
● If the radiating environment of indoor and outdoor unit is well.
Malfunction diagnosis process:
If the outdoor ambient temperature is
72
Anti-high temperature,
overload protection
higher than 53 ºC?
No
After the unit de-
energized for 20min
If the radiating of outdoor
and indoor unit is well?
No
If the indoor and outdoor
fan work well?
Yes Y
Replace
control board
AP1
End
Normal protection, please use
Yes
it after improve the outdoor
ambient temperature
Improve the
radiating
Y
Yes
environment of
unit
1. Check if fan terminal
OFAN is connected well
No 2. Test if resistance value
of any two terminals is less
than 1k with ohmic meter
Replace fan
capacitor C1
Replace
outdoor fan
Service Manual
Installation and Maintenance